If they dont say anything then I just kick as soon as we have downtime.

It's 1 kick, they'll get over it. They have no wait time into getting back into a dungeon. If it's not critical (ie they can return in a timely manner) then they should be just as capable of typing "afk brb" or something like that. Even a bunch of "wadsddsad" is enough for me to take pause for a kick. Just something.

But absolutely nothing? Kick.